1
			4	1
	2				5
2				6
	3	1
				3

Difficulty: Super easy (0)

		5			2
2				5
					3
5
	5				4
6			2

Difficulty: Easy (0)

		5	6
6	5
				4	3
		2	3

Difficulty: Easy (0)

				1
					2
2			3
		3			6
5
	2

Difficulty: Very easy (0)